Secure network computing

ABSTRACT

In one embodiment, a network element comprises one or more input/output ports, one or more processors, and a memory module communicatively coupled to the processor. The memory module comprises logic instructions which, when executed by the processor, configure the processor to receive a service request from a client computing device, wherein the service request identifies one or more resources available via a computing network, establish a first communication link between the network element and the one or more resources available via a computing network identified in the service request, establish a first, secure communication link between the network element and the client computing device, connect a network interface module on the client computing device to the secure communication link, and manage communication activity between the client computing device and the one or more resources available via a computing network at the network element.

RELATED APPLICATIONS

This application is a continuation-in-part of U.S. patent application Ser. No. 10/737,200 to Dispensa, et al., filed Dec. 15, 2003, which claims priority from U.S. Provisional Patent Application Ser. No. 60/433,059 filed Dec. 13, 2002, the disclosures of which are incorporated by reference herein in their entirety.

BACKGROUND

Internet access has become ubiquitous. In addition to traditional dial-up and Local Area Network-based network access, wireless access technologies including IEEE 802.11b and 802.11g (WiFi), WiMax, Bluetooth™, and others are being widely deployed. Many public locations, such as airports, bookstores, coffee shops, hotels, and restaurants have free or fee-based access to wireless Internet service. Some locations, such as hotel rooms, also offer internet access via Ethernet ports. In addition, businesses offer visiting professionals access to Internet service while they are on the premises.

Such Internet access services typically are not secured at the datalink layer. It is often possible for network administrators, other users, or even criminals to capture and view network transmissions made on these networks. The “last mile”, or the few hops on the network that are closest to the end user, are often only lightly secured, if at all, and are particularly vulnerable to traffic snooping. Enhanced communication security would find utility.

BRIEF DESCRIPTION OF THE DRAWINGS

The detailed description is provided with reference to the accompanying figures. In the figures, the left-most digit(s) of a reference number identifies the figure in which the reference number first appears. The use of the same reference numbers in different figures indicates similar or identical items.

FIG. 1 is a schematic illustration of a networked computing environment in accordance with an embodiment.

FIG. 2 is a schematic illustration of a server in accordance with an embodiment.

FIGS. 3-8 are flow diagrams of embodiments of methods for secure network computing.

DETAILED DESCRIPTION

Described herein are exemplary systems and methods for secure network computing. The methods described herein may be embodied as logic instructions on a computer-readable medium. When executed on a processor, the logic instructions cause a general purpose computing device to be programmed as a special-purpose machine that implements the described methods. The processor, when configured by the logic instructions to execute the methods recited herein, constitutes structure for performing the described methods.

In the following description, numerous specific details are set forth in order to provide a thorough understanding of various embodiments. However, various embodiments of the invention may be practiced without the specific details. In other instances, well-known methods, procedures, components, and circuits have not been described in detail so as not to obscure the particular embodiments of the invention.

FIG. 1 is a schematic illustration of a networked computing environment in accordance with an embodiment. In the exemplary architecture depicted in FIG. 1, one or more client computing devices 110 a, 110 b, 110 c establish a communication connection with a Point of Presence (POP) server 130, which in turn communicates with one or more target servers 140, 142, 144 via a network 120.

Client computing devices 110 a, 110 b, 110 c may be any computer-based communication device, including a personal computer 110 a, a personal digital assistant (PDA) 110 b, or a terminal device 110 c. Client computing devices 110 a, 110 b, 110 c establish a communication with POP server 130 via a communication network, which may be the same network 120 or a separate communication network. The particular form of communication network is not important. Communication network may comprise one or more direct communication links (e.g., a dial-up connection) between respective remote access devices 110 a, 110 b, 110 c. Alternatively, the communication network may comprise a private data network such as, e.g., an X.25 network, a local area network (LAN), a wide area network (WAN), or a public network such as, e.g., the Internet.

In one embodiment, POP server 130 may be implemented by a general purpose computing device such as, e.g., a server, that executes logic instructions which cause the processor to execute various methods for performing secure network computing. FIG. 2 is a schematic illustration of an exemplary computer system 200 adapted to perform secure network computing. The computer system 200 includes a computer 208 and one or more accompanying input/output devices 206 including a display 202 having a screen 204, a keyboard 210, other I/O device(s) 212, and a mouse 214. The other device(s) 212 can include a touch screen, a voice-activated input device, a track ball, and any other device that allows the system 200 to receive input from a developer and/or a user. The computer 208 includes system hardware 220 and random access memory and/or read-only memory 230. A file store 280 is communicatively connected to computer 208. System hardware 220 includes a processor 222 and one or more input/output (I/O) ports 224. File store 280 may be internal such as, e.g., one or more hard drives, or external such as, e.g., one or more external hard drives, network attached storage, or a separate storage network.

Memory 230 includes an operating system 240 for managing operations of computer 208. In one embodiment, operating system 240 includes a hardware interface module 254 that provides an interface to system hardware 220. In addition, operating system 240 includes one or more file systems 250 that managed files used in the operation of computer 208 and a process control subsystem 252 that manages processes executing on computer 208. Operating system 240 further includes a system call interface module 242 that provides an interface between the operating system 240 and one or more application modules 262 and/or libraries 264.

In operation, one or more application modules 260 executing on computer 208 make calls to the system call interface module 242 to execute one or more commands on the computer's processor. The system call interface module 242 invokes the services of the file systems 250 to manage the files required by the command(s) and the process control subsystem 252 to manage the process required by the command(s). The file system 250 and the process control subsystem 252, in turn, invoke the services of the hardware interface module 254 to interface with the system hardware 220.

The particular embodiment of operating system 240 is not critical to the subject matter described herein. Operating system 240 may be embodied as a UNIX operating system or any derivative thereof (e.g., Linux, Solaris, etc.) or as a Windows® brand operating system.

In one embodiment, memory 230 includes one or more network interface modules 262, 268, one or more secure tunnel modules 264, and one or more communication management modules 266. Network interface modules may be implemented as web browsers such as, e.g., Internet Explorer, Netscape, Mozilla, or the like. Secure tunnel module 264 comprises logic instructions which, when executed by a processor, configure the processor to generate a secure communication tunnel between the POP server 130 and a client computing device such as, e.g., one or more of client computing devices 110 a, 110 b, 110 c. Communication management module 266 comprises logic instructions which, when executed by a process, configure the processor to manage communications between the POP server 130 and one or more client computing devices 110 a, 110 b, 110 c and between the POP server 130 and the one or more servers 140, 142, 144.

In embodiments, POP server 130 receives a service request from a client computing device such as, e.g., one or more of client computing devices 110 a, 110 b, 110 c, identifying one or more resources available on a server such as 140, 142, 144. For example, the service request may be embodied as a Uniform Resource Locator (URL) transmitted to POP server 130 from a browser executing on a client computing device. In response to the service request, POP server 130 establishes a first communication link between the POP server 130 and the one or more resources available via a computing network identified in the service request. In one embodiment, POP server 130 may launch an independent request for the resource request for the resource identified in the service request from the client computing device. POP server 130 may further establish a first, secure communication link between the POP server 130 and the client computing device 110 a, 110 b, 110 c, and connect a network interface module on the client computing device to the secure communication link.

POP server 130 may further manage communication activity between the client computing device and the one or more resources available via a computing network at the POP server. In one embodiment, managing communication activity may include passing information received from a server 140, 142, 144 in response to a resource request from the POP server 130 to a client computing device 110 a, 110 b, 110 c via a secure communication link.

Operations implemented by the various modules 262, 264, 266, 268 and by client computing devices 110 a, 110 b, 110 c are explained with reference to FIGS. 3-8. FIGS. 3-8 are flow diagrams of embodiments of methods for secure network computing. FIG. 3 is a flow diagram illustrating high-level operations executed by a computing device such as one of client computing devices 110 a, 110 b, 110 c in a method for secure network computing. In one embodiment, at operation 310 a secure communication link is initialized between POP server 130 and the client computing device 110 a, 110 b, 110 c. At operation 315 the client computing device sends outbound data via the secure communication link and at operation 320 the client computing device receives inbound data via the secure communication link. If, at operation 325 there are more outbound data requests, then control passes back to operation 315. Similarly, if at operation 330 there is more inbound data control passes back to operation 320 and the inbound data is received. If there are no further data requests or inbound data remaining, then control passes to operation 335 and the secure communication link may be terminated. Operations illustrated in FIG. 3 are explained in greater detail in FIGS. 4-8.

FIG. 4 is a flow diagram illustrating operations in a method for initializing a secure communication link between POP server 130 and a client computing device 110 a, 110 b, 110 c. In one embodiment, POP server 130 implements an application tunneling technology, referred to herein as an AppTunnel, to construct a secure communication tunnel between POP server 130 and a client computing device 110 a, 110 b, 110 c.

Referring to FIG. 4, at operation 410 POP server 130 receives an address of one or more resources such as, e.g., a website or other resource available on network 120. In one embodiment, the address received may represent a URL received in a service request from a web browser executing on client computing device 110 a, 110 b, 110 c. In one embodiment, POP server 130 transmits an ActiveX control comprising launch data to client computing device 110 a, 110 b, 110 c. In alternate embodiments, the ActiveX control client may be replaced with a plug-in module compatible with other protocols such as, for example, the JAVA architecture or a CORBA architecture.

At operation 420 the client computing device 110 a, 110 b, 110 c receives the ActiveX launch data from server 130. If, at operation 425 the client computing device is not compatible with ActiveX technology, then control passes to operation 465 and a rewriter host module may be activated. This procedure is explained in greater detail below. By contrast, if the client computing device 110 a, 110 b, 110 c is capable of implementing an ActiveX control, then control passes to operation 430 and the client computing device 110 a, 110 b, 110 c, activates an ActiveX control host page. The Active X control host page instructs the browser how to load the ActiveX control, where to retrieve it from (if it is not already locally cached), and with what parameters the control should be started. A similar host page may be used to embedding plug-ins into other browsers such as Mozilla, Netscape, etc. This information may contained in an HTML <OBJECT>tag.

At operation 435 the client computing device 110 a, 110 b, 110 c initiates the ActiveX control received from the server 130. The ActiveX control causes the client computing device 110 a, 110 b, 110 c to launch a new incidence of a browser or other network interface software (operation 440). If additional ActiveX controls are necessary to enable the client computing device 110 a, 110 b, 110 c, then one or more additional ActiveX controls maybe transmitted between the server 130 and the client computing device 110 a, 110 b, 110 c.

At operation 450 the client attaches a secure channel module to the browser. In one embodiment, the secure channel module may be embodied as an AppTunnel client module. The AppTunnel secure channel module is described in detail in U.S. patent application Ser. No. 10/737,200, incorporated by reference here above. Portions of that description are excerpted in the following paragraphs.

Application tunneling is a method for transporting data from a user's computer to a third party computer (a “proxy”). In one implementation, Application data may be intercepted as soon as it is sent (i.e., above layer 4 of the OSI model), before it is encapsulated by Internet protocols such as TCP, UDP, or IP. Data may then be transported across the network to the proxy. In other implementations, this application-level data is acquired differently (perhaps, for example, through the use of a virtual adapter). In all cases, it is application-level data (OSI layers 5-7, depending on the application and the protocol) that is tunneled via AppTunnels.

AppTunnels is application tunneling technology that tunnels data from an application on a first computer to a second computer, perhaps over a secure tunnel, for further processing and proxying at that other computer. AppTunnels technology may be implemented in a Static form or in a Dynamic form. Static AppTunnels technology requires manual (or pre-configured) establishment of the application tunnels and listeners. By contrast, dynamic AppTunnels implements on-the-fly tunnel creation using hook mechanisms.

Encryption and/or other security technologies may be applied to the tunnel to add security to the data being transported, although this is not strictly necessary.

AppTunnels differs from existing tunneling technologies such as Generic Routing Encapsulation (GRE) in that it is designed to operate at the end user's computer, in such a way that the end user's applications do not have to be informed about the existence of the tunneling technology. By contrast, tunneling technologies such as GRE, on the other hand, are designed to be implemented in network elements such as routers.

AppTunnels differs from host-based encryption technologies such as SSL in several ways. First, SSL technology must be directly supported by the application in order to be applied. AppTunnels, however, does not. require application awareness in order to be applied. Furthermore, SSL is closely tied to a particular security and encryption architecture. AppTunnels may be used with or without security technologies, and imposes no requirements on the underlying security technologies. AppTunnels has been used in conjunction with the WTP security protocol and with SSL.

To intercept the network traffic of an application a local listener is created and a tunnel is established between the first computer and the second computer. In one embodiment, a local listener may be implemented as listening TCP, UDP, or other socket(s) bound to a local host address (e.g., 127.0.0.1) on a computer. The port number, where applicable, may be determined by the tunneled application, and may be arbitrary in some protocols. Local listeners may be created either in response to instructions from dynamic AppTunnels hooks or by static configuration received in advance. It is also possible for a user to manually initiate the creation of a listener (and its associated tunnel). A data tunnel may be created between the AppTunnels client software and a compatible tunnel module on a server. In one embodiment, the tunnel may be implemented in accord with the WTP protocol described in U.S. patent application Ser. No. 10/737,200.

Once an AppTunnel has been initialized, the end user application can be directed to connect to the AppTunnel. The process for this varies per application. In the case of Dynamic AppTunnels, no other action is necessary; data simply starts flowing from the application to the AppTunnels software, which in turn tunnels the data across the connection to the WTP concentrator.

In the case of Static AppTunnels, one additional step is required. The application is tricked into connecting to the local listener instead of to the target server, as would otherwise naturally be the case. To trick the client, the DNS system is configured to return the local host address (127.0.0.1, usually) to requests for the destination server's IP address. This is usually done by changing the locally-present “hosts” file that the computer's DNS system consults before returning an IP address. This hosts file is modified, with an entry being inserted for the name of the target server with the IP address of local host. In one embodiment, the AppTunnels client may be implemented as an executable component that is incorporated into and run by the user's web browser such as, e.g., an ActiveX control. For other browsers or other platforms, a Netscape Plugin may be used.

In one embodiment, AppTunnels implements a method of intercepting traffic in order to tunnel it is as follows: First, the computer's DNS resolution system is modified to re-route traffic for target network servers to the local computer. Next, the AppTunnels Client establishes itself as a server on the port that the application would expect to connect to. Once established, applications transparently connect to the Client on the local computer rather than to their natural target-network servers. No configuration or modification of the tunneled application is necessary.

The AppTunnels method can be used to tunnel any user-mode data over a tunnel to the server 130. This includes TCP and UDP on all platforms. Other protocols may be available for tunneling, depending on the platform. The AppTunnels architecture supports complex network protocols such as FTP, RPC, H.323, and other proprietary multi-connection protocols. It provides this support by inspection of protocol data at the server. A protocol may be termed ‘complex’ if it requires more than a simple client-to-server TCP connection.

In AppTunnels mode, the client computing device 110 a, 110 b, 110 c receives a module called the AppTunnels Client, which attaches to the web browser. The AppTunnels client enables the web browser to access target network web pages by proxying requests through the AppTunnels client. The AppTunnels client forwards the requests to the server 130, which retrieves the requested document and returns it to the AppTunnels client, which in turn returns it to the web browser.

In brief, the client computing device 110 a, 110 b, 110 c first reads the proxy settings configuration from the user's web browser. The client computing device 110 a, 110 b, 110 c stores the proxy settings and configures the browser to use a proxy auto-configuration file. This file instructs the browser to request its new proxy settings from the AppTunnels client. The request is made and replied to, and the new settings cause all further requests for documents to be proxied through the AppTunnels client.

The AppTunnels client then establishes a connection to server 130 and authenticates itself. After authentication, the AppTunnels client establishes itself as a server application and listens for incoming requests from the browser. As requests are received, they are forwarded to server 130. Responses are read in from the server and are sent back to the waiting browser.

The browser is monitored by Dynamic AppTunnels for any network communication attempts. In one embodiment, these attempts may be monitored using function call hooks of the Microsoft Winsock library, but other hooks are possible, as are other monitoring architectures (such as, for example, Winsock Layered Service Providers). When new network traffic is detected, it is intercepted by the Dynamic AppTunnels code for further processing.

In one embodiment, child processes created by the browser may be injected with the Dynamic AppTunnels monitoring code. Thus, network traffic generated by child processes send will be encapsulated in the AppTunnel. Child process monitoring may be implemented using an API hook for all of the CreateProcess( ) family of functions. When a call to CreateProcess( ) is made, the Dynamic AppTunnels code receives it first, and ensures that the monitoring code is injected in the resulting new process.

In one embodiment, dynamic AppTunnels technology is implemented using API hooks. When dynamic AppTunnels receives a request to start a tunneled process, it creates a new process using the CreateProcess( ) API call. A new process may be created as suspended, so that the process does not run after it is initially created. At this point, one or more imported functions are substituted, or hooked, such that they point to wrapper functions that are part of the Dynamic AppTunnels software. The hooked functions are of two classes: network functions and process management functions.

In particular, the CreateProcess( ) function (and its relatives) may be hooked so that any child processes that are created can have the Dynamic AppTunnels monitoring code injected as well. This code is responsible for signaling the browser plugin that it should inject the rest of the hooks into the newly created process. Any child processes of that child are treated in the same way.

The networking functions that are hooked are related to connection requests and to name resolution requests. In general, all functions that are called during initial connection setup are intercepted. Once hooked, these functions receive any connection requests, and use this information for two purposes. The first is to coordinate with the tunneling protocol on the AppTunnel server to create an additional AppTunnel between the client and the AppTunnel server, and to create a local listener that is attached to that tunnel. The second is to re-direct the requesting application to the local listening socket, so that connections are made it instead of to the original target server. This process allows network traffic generated by the client to be captured by the browser plug-in and tunneled.

Alternatively, the plug-in may choose to examine the connection request information and make a decision at runtime as to whether the traffic should be tunneled or allowed to go straight out to the network as it otherwise would have. These decisions can be based on names (such as DNS or WINS names), network addresses, port numbers, or other identifying information. While this description has largely been written in the context of TCP sockets, it should be pointed out that other kinds of network traffic may be supported, including UDP and raw IP packets.

Referring back to FIG. 4, at operation 455 the browser instantiated at the client computing device 110 a, 110 b, 110 c loads the requested resource, which may be displayed on a suitable user interface such as, e.g., a computer screen or the like. At operation 460, subsequent data transfer operations between the client computing device 110 a, 110 b, 110 c and the server 130 are conveyed through the secure tunnel. When the user of the client computing device is finished with the browsing session, the browser may be closed. Closing the browser also closes any dynamic AppTunnels constructed between the client computing device 110 a, 110 b, 110 c and the server 130.

FIG. 5 is a flow diagram illustrating operations in a method for implementing an AppTunnel on a client computing device 110 a, 110 b, 110 c. In one embodiment, the ActiveX control transmitted from the server 130 to the client computing device operations of FIG. 5 may cause the client computing device to perform the operations illustrated in FIG. 5.

Referring to FIG. 5, at operation 510 one or more static listeners and AppTunnels are initialized on the client computing device. At operation 515 the AppTunnels plugin (i.e., the ActiveX control) receives a request to start an application. For example, the plugin may receive a request to start an instance of a browser.

At operation 520 it is determined whether the device supports dynamic AppTunnels. As described above, AppTunnels can operate in either a static mode or in a dynamic mode. The difference is in the way the data is acquired for tunneling. Static AppTunnels uses a static local listening TCP/IP socket for each pre-configured service. If a user wants to use a web browser over a static AppTunnel, for example, there must be a configured application tunnel listening on TCP port 80 on the local host. Furthermore, the destination address for the AppTunnel must be specified. To cause the user's application to connect to the AppTunnels socket instead of trying to use Internet routes in the usual way, the DNS system of the client computing device is configured (usually using the computer's hosts file) to change the IP address of the server in question to point to the local host (usually 127.0.0.1), thereby fooling the application into making a local connection to the listening socket.

Thus, referring to FIG. 5, if at operation 520 dynamic AppTunnels is not enabled, then control passes to operation 525 and the DNS system is configured, and at operation 530 a local listening socket is created. At operation 535 a new process is created.

By contrast, if at operation 520 the device accommodates dynamic AppTunnels, then control passes to operation 540 and a new process is created on the client computing device. In one embodiment creating a new process may involve a user clicking an HTML link on the web page in a browser executing on the client computing device. The ActiveX control then launches the new process and injects the Dynamic AppTunnels application monitoring code into the newly started process (operation 545). At operation 550 a new AppTunnel is created between the client computing device and the server 130.

Following either operation 535 or 550, control passes to operation 560 and the application receives data in the listening socket generated by the AppTunnel. At operation 565 the data received in the AppTunnel is removed and passed to the process (i.e., the web browser) for further processing and presentation to a user via a suitable interface such as, e.g., a display. Operations 560-565 may be repeated until, at operation 570, there is no more data to tunnel, whereupon operations terminate.

FIG. 6 is a flow diagram illustrating operations in a method for processing outbound traffic from a network interface module such as, for example, a web browser. executing on a client computing device 110 a, 110 b, 110 c. The operations of FIG. 6 depict traffic processing for a browser that has an AppTunnel module attached to the browser. Referring to FIG. 6, at operation 610 the web browser receives an address of a resource available on network 120. In one embodiment, the address may represent a Uniform Resource Locator (URL) of a resource available on network 120. At operation 615 the browser initiates a service request for the resource. At operation 620 the service request is intercepted by the AppTunnel module. At operation 625 the AppTunnel client secures the request data and at operation 630 the AppTunnel client forwards the request to the POP server 130. At operation 640 the secured request is received at the POP server 130. At operation 645 the secure tunnel module 264 (i.e., the AppTunnel server) extracts the request data from the secure tunnel.

At operation 650 the POP server forwards the service request to the address identified in the service request. In one embodiment, the service request is received in a first network interface module 262 instantiated on POP server 130, and POP server 130 instantiates a second network interface module 268 and launches a service request from the second network interface module.

FIG. 7 is a flow diagram illustrating operations in a method for processing inbound traffic such as, for example, one or more resources returned from a service request. Referring briefly to FIG. 7, at operation 710 the data returned by the resource request is received at the POP server 130. In one embodiment, the data is received in the second network interface module 268 instantiated on the POP server 130. At operation 715 the response data is secured. In one embodiment, response data is operated on by the secure tunnel module 264. At operation 720 the response data is placed in the secure tunnel to the client computing device 110 a, 110 b, 110 c via the first network interface module 262.

At operation 725 the client receives the response data transmitted to the client by the server. At operation 730 the data is removed from the secure tunnel established by AppTunnels. In one embodiment, the AppTunnels client attached to the browser in the client computing device 110 a, 110 b, 110 c removes the received data from the tunnel and, at operation 735, forwards the data to the web browser. The web browser may present the data on a user interface such as, e.g., a display, for viewing by the user.

Referring back to FIG. 4, if at operation 425 the client computing device is not capable of executing a plugin such as, e.g., an ActiveX control, then control passes to operation 465 and a URL rewriter technique is activated. URL rewriting is a method of providing a reverse proxy server for use in secure remote access systems and other applications without the need for any locally installed code. Most web browsers can exchange traffic with web servers using a protocol known as secure HTTP, or HTTPS. However, most websites do not support HTTPS. To add security to every website the user requests, special HTTPS requests are made to a URL rewriter server instead of the target web server, using HTTPS to the rewriter. The rewriter then forwards the request to the target web server by proxy, using the expected destination protocol of the web server (typically HTTP). On return, the web data is returned over HTTPS to the client's browser. It should be noted that any other form of browser-based security, or no security whatsoever, could be used in the communications link to the rewriter.

It should be noted that references to other web data will now cause the user's browser to make direct requests to the target server, rather than ask the rewriter server. Thus, references to other web content (hyperlinks, images, java applets, and so on) may be rewritten in the webpage so that they refer to the rewriter instead of to the target server to ensure that all web traffic is routed through the rewriter, and not via direct connections. Accordingly, any web references in the returned document are rewritten with references to the URL rewriter server.

FIG. 8 is a flow diagram illustrating operations in a method for processing inbound traffic such as, for example, one or more resources returned from a service request. Referring briefly to FIG. 8 at operation 810 a rewriter host page on the client computing device 110 a, 110 b, 110 c launches a second web browser using instructions embedded in the HTML and JavaScript code that is a part of the page. At operation 815 the rewritten URL is written into the second browser. At operation 826 the second browser requests the specified resource using the rewritten URLs.

At operation 825 the server 130 receives the service request from the client computing device 110 a, 110 b, 110 c. At operation 830 the server 130 un-rewrites the URL, and at operation 835 the server retrieves the requested resource from the server 140, 142, 144 hosting the resource on the network 120. At operation 840 the server rewrites the embedded URLs in the retrieved resource, and at operation 845 the server returns the rewritten resource to the client.

At operation 850 the client computing device 110 a, 110 b, 110 c receives and processes the requested resource. In one embodiment, processing the requested resource may include presenting the resource on a suitable display. If at operation 855 there are more requests to be processed, then control passes back to operation 820, and the browser requests the specified resource(s). By contrast, if at operation 855 there are no further resource requests, then the process terminates.

Thus, the operations described in FIGS. 3-8 enable a client device such as one or more of client computing devices 110 a, 110 b, 110 c to establish a secure “last mile” communication link, thereby enabling secure communication with resources hosted by one or more servers 140, 142, 144 in a network 120. The systems and methods described herein are agnostic regarding the type of encryption applied (if any) to communication links between POP server 130 and servers 140, 142, 144.

The systems described above are browser-based systems. In alternate embodiments, a client computing device 110 a, 110 b, 110 c may download and install a permanent piece of client encryption module onto the end user's computer. The permanent client provides encryption services between the client computing device 110 a, 110 b, 110 c and the servers 140, 142, 144. With a permanent client encryption module, the end user does not have to navigate to the service provider's website in order to turn on secure surfing. Further, a client-based approach can support all Internet-based applications.

In another embodiment, an ActiveX control installs and initializes a virtual VPN Miniport, as described in U.S. patent application Ser. No. 10/737,200. The ActiveX control captures and processes any relevant traffic on the computer. In this way, end user traffic is directed into the secured tunnel described above.

A virtual VPN Miniport can support non-TCP protocols, while maintaining the convenience of a web-based environment. It can also secure applications that have already been started. For example, if the end user were running an instant messaging client, that client's communications would be secured from the time of connection forward, without a need to re-launch the client. Installation of a VPN driver can be silent and automatic, and only needs to occur one time. From that point on, the ActiveX control activates the VPN driver and manages network routes to cause traffic to be directed into the VPN driver for encryption.

Access to the POP server 130 may be provided by a number of methodologies. In one embodiment access to POP server 130 may be provided on a pay-for-service business model. In this embodiment, POP server 130 may include a transaction processing module to process payment transactions, e.g., by a credit card or other payment mechanism. Charges may be levied on the basis of bandwidth consumed, or by a time parameter (i.e., minutes, hours, days, years, etc.).

In alternate embodiments access to server 130 may be implemented on the basis of advertising revenue. For example, pay-per-click advertising can be implemented, using randomly-selected advertisements, pay-per-click advertising can be implemented, using information gained by inspecting the user's traffic during secure surfing to select targeted advertisements, or traditional Internet banner advertisements can be inserted, either randomly or based on inspection of the secured data. Advertisements can be inserted in the initial service provider web page, in the refreshed web page that hosts the ActiveX control, or even inline with the displayed web pages.

Multiple levels of service may be defined. For example, low-quality service might be provided free of charge, while high-quality service might be provided for a fee. Service levels may be differentiated by one or more facts such as, for example throughput. (i.e., a performance aspect might be controlled), bandwidth (i.e., the total number of bytes transferred might be capped), data transfer (i.e., a transfer cap might be imposed per day, per month, or per year), or some combination thereof. Other options include allowing only a limited amount of time to use the system or bandwidth in a tier or a certain amount of throughput for a certain amount of time, with decreased throughput after the elapse of that time, or restricting access to certain resources based on the service level.

Last-mile encryption service may be provided to a user with no pre-existing account. The web-based interface can be used simply by entering the address of a website that is to be securely accessed. In the installed client case, the user logs in anonymously using the supplied anonymous login method. Anonymous users may be granted a different tier of service, as described above.

In an anonymous user case, cookie-based, form-based, or IP address-based information may be used to correlate the anonymous user's browsing activities, for purposes including providing advanced service features (such as browsing history, enhanced status reporting, etc), selecting relevant advertising, or for other purposes.

Users that desire temporary top-tier service may be given the option of paying electronically for a one-time use of the service without creating an account.

Users that wish to use the service repeatedly may wish to create a user account. The user account could then be used to track browsing history, make more intelligent decisions about advertising content to be presented, or offer other value-added services. Users of the service would then be prompted to log in to the website (or to the downloaded client software) using the established authentication credentials. Optionally, a cookie-based login persistence mechanism can be supported, allowing the user to go for a period of time without the need to log in.

Reference in the specification to “one embodiment” or “an embodiment” means that a particular feature, structure, or characteristic described in connection with that embodiment may be included in at least an implementation. The appearances of the phrase “in one embodiment” in various places in the specification may or may not be all referring to the same embodiment.

Also, in the description and claims, the terms “coupled” and “connected,” along with their derivatives, may be used. In some embodiments, “connected” may be used to indicate that two or more elements are in direct physical or electrical contact with each other. “Coupled” may mean that two or more elements are in direct physical or electrical contact. However, “coupled” may also mean that two or more elements may not be in direct contact with each other, but may still cooperate or interact with each other.

Thus, although embodiments of the invention have been described in language specific to structural features and/or methodological acts, it is to be understood that claimed subject matter may not be limited to the specific features or acts described. Rather, the specific features and acts are disclosed as sample forms of implementing the claimed subject matter. 

1. A method comprising: receiving, at a point of presence (POP) server, a service request from a client computing device operating a plurality of applications, wherein the service request identifies one or more resources available via a computing network; establishing a first communication link between the POP server and the one or more resources available via a computing network identified in the service request; establishing a second, secure communication link between the POP server and the client computing device, wherein the second, secure communication link comprises a secure communication tunnel, wherein the plurality of applications at the client computing device are not aware of the secure communication tunnel, and wherein establishing the second, secure communication link between the POP server and the client computing device comprises: sending an ActiveX control from the POP server to the client computing device; launching the ActiveX control in the client computing device; launching, by the ActiveX control, a network interface module; and connecting, by the ActiveX control, the secure communication tunnel to the network interface module; and managing communication activity between the client computing device and the one or more resources available via the computing network at the POP server.
 2. The method of claim 1, wherein the first communication link between the POP server and the one or more resources comprises an unencrypted communication link.
 3. The method of claim 1, wherein the first communication link between the POP server and the one or more resources is secured using a first encryption protocol and the second, secure communication link is encrypted using a second encryption protocol.
 4. The method of claim 1, wherein the secure communication tunnel communicates via a predetermined communication port on the client computing device.
 5. The method of claim 1, wherein the secure communication tunnel communicates via a dynamically selected communication port on the client computing device.
 6. The method of claim 1, wherein establishing the second, secure communication link between the POP server and the client computing device comprises initiating a request to a URL rewriter server.
 7. The method of claim 1, wherein establishing the second, secure communication link between the POP server and the client computing device comprises invoking a virtual private network (VPN) driver installed on the client computing device.
 8. The method of claim 1, further comprising inserting advertising content into the second, secure communication link between the POP server and the client computing device.
 9. The method of claim 1, further comprising: monitoring communication content on the second, secure communication link; and inserting advertising that correlates with the communication content into the second, secure communication link between the POP server and the client computing device.
 10. The method of claim 1, wherein managing communication activity between the client computing device and the one or more resources available via the computing network at the POP server comprises maintaining a communication interface to manage communications between the first communication link and the second, secure communication link.
 11. The method of claim 1, further comprising: initiating a second service request from the client computing device, wherein the second service request identifies one or more second resources available via the computing network; establishing a third, communication link between the POP server and the one or more second resources available via the computing network identified in the second service request; establishing a fourth, secure communication link between the POP server and the client computing device; connecting the network interface module on the client computing device to the fourth, secure communication link; and managing communication activity between the client computing device and the one or more second resources available via the computing network at the POP server.
 12. The method of claim 1, wherein establishing the second, secure communication link between the POP server and the client computing device comprises configuring a Domain Name Server (DNS) system of the client computing device to change an IP address of the POP server to point to a local host.
 13. The method of claim 1, wherein one of the plurality of applications is an instant messaging application.
 14. A network element, comprising: one or more input/output ports; one or more processors; a memory module communicatively coupled to the one or more processors and comprising logic instructions which, when executed by the one or more processors, configure the one or more processors to: receive a service request from a client computing device operating a plurality of applications, wherein the service request identifies one or more resources available via a computing network; establish a first communication link between the network element and the one or more resources available via the computing network identified in the service request; establish a second, secure communication link between the network element and the client computing device, wherein the second, secure communication link comprises a secure communication tunnel, wherein the plurality of applications at the client computing device are not aware of the secure communication tunnel, and wherein establishing the second, secure communication link between the POP server and the client computing device comprises: sending an ActiveX control from the network element to the client computing device; and generating a message that causes the ActiveX control to be launched in the client computing device, wherein the ActiveX control launches a network interface module in the client computing device and connects the secure communication tunnel to the network interface module; and manage communication activity between the client computing device and the one or more resources available via the computing network at the network element.
 15. The network element of claim 14, wherein the memory module further comprises logic instructions which, when executed, cause the one or more processors to maintain a communication interface to manage communications between the first communication link and the second, secure communication link.
 16. The network element of claim 14, wherein the memory module further comprises logic instructions which, when executed, cause the one or more processors to insert advertising content into the second, secure communication link between the network element and the client computing device.
 17. The network element of claim 14, wherein the memory module further comprises logic instructions which, when executed, cause the one or more processors to: monitor communication content on the second, secure communication link; and insert advertising that correlates with the communication content into the second, secure communication link between the network element and the client computing device.
 18. The network element of claim 14, wherein the memory module further comprises logic instructions which, when executed, cause the one or more processors to: receive a second service request from the client computing device, wherein the second service request identifies one or more second resources available via the computing network; establish a third communication link between the network element and the one or more second resources available via the computing network identified in the second service request; establish a fourth, secure communication link between the network element and the client computing device; connect the network interface module on the client computing device to the fourth, secure communication link; and manage communication activity between the client computing device and the one or more second resources available via the computing network at the network element.
 19. A method comprising: receiving, at a point of presence (POP) server, a request from a client computing device operating a plurality of applications, wherein the request identifies at least one resource available via a computing network; establishing a first communication link between the POP server and the at least one resource; and establishing a second, secure communication link between the POP server and the client computing device, wherein the second, secure communication link comprises a secure communication tunnel, wherein the plurality of applications at the client computing device are not aware of the secure communication tunnel, and wherein establishing the second, secure communication link between the POP server and the client computing device comprises: sending an ActiveX control from the POP server to the client computing device; and launching an ActiveX control in the client computing device, the ActiveX control launching a network interface module and attaching the secure communication tunnel to the network interface module. 